Index: trunk/doc/tutorial/simulation/raw/18_opamp_ac.html
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--- trunk/doc/tutorial/simulation/raw/18_opamp_ac.html	(revision 7873)
+++ trunk/doc/tutorial/simulation/raw/18_opamp_ac.html	(revision 7874)
@@ -4,7 +4,7 @@
 
 <h2> Scope </h2>
 <p>
-Notch filter built of two opamps: this filter passes a signals between DC
+Notch filter built with two opamps: this filter passes a signals between DC
 and 100 kHz but filters out 1 kHz signals. Demonstrates using slotted
 opamp with simulation.